So far a total of 19 cases______ and another 36 people are being treated on the assumption that they are infected with Legionnaires Disease.

A．were confirmed

B．have confirmed

C．are confirmed

D．have been confirmed

我国国际航班的航班号是由执行该航班任务的航空公司的二字英语代码和( )个阿拉伯数字组成。

A．一

B．两

C．三

D．四